The first issue discussed is about deleting content and adding it again on the default.twig. This should throw an error but it's not (when you try it). So, if you can generate a few steps to replicate it, that would be great.

The second issue is about the syntax. I have raised this to our product team (as it is a product request more than a bug) and asked them if we can add this to the roadmap.

Let me know about the reproduction steps, and we'll get back on the case.